This study is to make a reliable database from the boods titled who's who of the Japanese companies [Zenkoku Sho-kaisha Yakuin-roku], which were published in Meiji era, Taisho era and Showa era on the data of top management and the companies. We make data bases of 1898 and 1907 with three types data files each year. On the management data, we dicide to select of such data as company's name which they were belonged to and their positions. And on the company data, we do such data as company organization, the date of incorporated, capital stock and the numbers of branches.When we will make a reliable data base, we must check the input data with referring to the original books and correct the data and character, and alsochange the old type character to new type character in order to be used wider. Then we make the list of changes. As a result of this study, we calculate the numbers of management and companies written on the books, they are 32,559 and 4,050 in 1898 and 47,383 and 7,200 in 1907 respectively. And also we can estimate the structure of the company organization and inter-locking directors in Meji era. Now we expect the further research and offer the aspect of the structure and the structural change of Japanese economy in Meiji era and Taisho era in near future.